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INVENTORIES (Inventories) (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
INVENTORIES [Abstract]    
Finished products [1] $ 391,666 $ 372,604
Raw materials 31,318 27,942
Products in process 5,604 3,064
Operating supplies and other 29,720 25,720
Inventories 458,308 429,330
Encumbered inventories $ 2,861 $ 3,230
[1] Includes inventories encumbered by volumetric production payments (see Note 2), as follows: December 31, 2019 — $2,861 thousand and December 31, 2018 — $3,230 thousand.